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A199239
Number of n X n 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or two horizontal or vertical neighbors
0
1, 2, 6, 440, 29227, 1682457, 2013526831
OFFSET
1,2
COMMENTS
Diagonal of A199246
EXAMPLE
Some solutions for n=4
..0..1..0..1....0..1..1..2....0..1..0..2....0..1..1..0....0..1..0..1
..1..2..2..0....2..1..1..0....2..0..2..1....2..1..1..2....1..0..2..0
..0..2..2..1....0..2..0..2....1..2..1..0....1..0..2..0....0..2..0..2
..2..1..0..2....2..1..2..0....2..0..2..1....0..2..0..2....2..1..2..1
CROSSREFS
Sequence in context: A252741 A069261 A053608 * A123261 A124061 A354516
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 04 2011
STATUS
approved